There’s a certain segment of my piping system will see a thermal shock over a certain period of time on a daily basis.
I have a case of introducing a steam at 300F to a main line that its inside metal temperature is 700F that happens for 30min daily for the life of the plant, which will create a temperature difference over the wall thickness of the pipe. Right?!
My question is; how can I qualify this particular piping segment that sees the conditions above using CAESARII to make sure this temperature swing over this short period will not affect this pipe?!!
I appreciate your input

Dear most2050,

There are two aspects of the problem; One, to compute the temperature differential across the section and other to check its effect.First issue can be dealt with by heat transfer analysis.If that is difficult , assume a conservative estimate of inside and outside temperatures . Then use SEC III subsection NB where rules govern this case. Whether or not fatigue analysis is required depends on how many such cycles are there.I used this method in a thermal shock analysis in an LNG plant. Of course issues like metallurgical transformations due to rapid cooling rate like martensitic transformation or precipitation hardening are issues which the above solution methods will not address, although they do not appear to be issues significant to your problem.

Regards

anindya,appreciate your input. Since it’s the first time for me to do such analysis, I need a little bit of time to look it then. Thanks again for enlightening my way